Full time rv living

you also need to check local laws. In some counties you cannot live in an RV unless it is located in an RV Park. We are parked in a driveway temporarily in Florida and the code enforcement people came by and said we cannot hook it up. You could ask for a temporary permit??

As a current (almost) full time RVer and a NE Ohio native .....
Forget it. A suitable RV and the necessary facilities for an Ohio winter would be prohibitively expensive. A year in a motel would be cheaper.

Will zoning, neighbors, health authorities allow you to park and live in a RV in the backyard of someone's house? Most places will not allow it.

IMO you are designing a life of hardships. If that's what you want for your family, that's YOUR business.
I have many years of RVing experiences. We even fulltimed (2 adults and 2 small dogs) in a new 40ft diesel pusher with slideouts and all the options. We quit fulltiming after 3 years (mostly in mild climates). It's too costly, and way too small a space for fulltiming. It's great for RVing. We're all different.

Even with "free parking" you have some challenges. With a house you have 4 to 6 inches of wall insulation, RV has 2 at best, house 6 to 12 inches in cieling/roof, RV maybe 4, and house floor 6" , RV maybe 1/2". A four seasons, or arctic package , something with an enclosed underbelly is a start. The enclosed belly and a section of duct going through it helps keep pipes and tanks from freezing but only if the furnace is running, and those are very propane hungry. Most in rv's tend to heat as much as possible with a little buddy or if available electric space heaters also.
You will have to run a garden hose to their house and it will have to be insulated and heated, there are heat tapes you can use for that. For the waste you first need to know if they are on a septic tank, or a city sewer system. If septic, there is a cleanout port on the buried tank that you can access, if city sewer you have to be able to tap the line, and chances are that your trailer will be in the back yard and the line will leave the house in the front yard, so depending on construction this could get expensive and complicated. You also have to keep that line from freezing up.
Also if the inlaws are in a city or town , check local ordinances, is a connected rv allowed? One nosey neighbor can cause a wide range of headaches.
Skirting would be needed, hay bales are an old tried and true method but there are manufactured products too.
There are articles online as well as you tube vids of folks doing it and how they do it, but research it well, because trying to change it in mid winter would be a pain.

Thank you everyone for the advice. I guess I should have gone more in-depth. We are parking it in my in-laws back yard so that's why I was trying to figure out if you can hook up to a house. So if something happens during winter it will just be a walk to their house. Also we have been slowly downsizing over the past year from a 2500 sq ft house to 1000 sq ft now down to about 350 hopefully soon. We want to build a tiny home and live the minimalist off the grid life as much as possible so we aren't too worried about space. Also we have a 10×12 shed that will be going with us for storage. We were told to make sure the underneath of the trailer is very well insulated and someone said to put skirting up and hay bales underneath but I'm afraid that would attract critters?!

We've been full time rv living for 7 years as thousands others do. Very few spend time in areas subject to temps below freezing for any duration. In our 7 years we've only been in an area that temps went below 20F and that was only one night and we were only there for seasonal work which ended just before Christmas. Our winter preference is south Florida or south Texas.

it depends on the rv. A high quality true 4 season unit will cost you, serve you, but resell well . There are only a few mfgrs of trailers, less of MHs that are capable of wintering.
Utilities are the issue. Fresh and waste water are high challenges in freezing weather; it becomes not so much an issue of heating the rv as it does keepin the services.
All in all, its not cheap or easy. For just a winter, likely not financially sound. Certainly not for short term housing considering the work and cost of winterized water and waste lines.

WE (2 adults 1 large dog) lived FT in a 34' 5th wheel for 7 yrs traveling.

Roughly 280 sq.ft living space......comfy but !!!!

Our 5th wheel is rated '4 season'......insulation value, heated tanks, high btu furnace/high but A/C Unit.

Expenses were same as for groceries, clothing, MEDICAL, any debt etc.
Insurance was similar as we had a Home Owners Policy on 5th wheel and same coverage on truck

BUT...
we didn't have cost of 5th wheel....no financing
we didn't have cost of truck....no financing
electric costs were similar but propane varied depending on propane usage
(COLD weather...-19*F used a 30# propane cylinder each day. WARM weather propane would go 5-6 weeks and we used it for cooking/fridge/water heater etc)

RV living FT is NOT necessarily cheaper..
Can be less expensive IF current costs are HIGH but one has to really pay attention to costs........and then there is maintenance costs. Things break..even in new rigs.

2 Kid/2 adults..........tight quarters. And can get smaller and smaller each passing day.

Saving up to buy property/build house.
Get cheaper place rent wise and buckle down. At least the kids will stay warm and have some breathing room----you too>

RVng is a great lifestyle....just not basically a cheap one

Good Luck!

Just get a 4 season trailer or truck camper, and yes you can hook it up to a home. Start reading everything you can about RV's ASAP!