can you reduce 50 amp service to 30 amp?

And you can further reduce down from the 30A to 15A for use when visiting the mother-in-law.

Thanks for the info, will get a adapter, good idea to carry it with me.

Yes you can with the proper adapter like this 50 to 30 Adapter Just a note with the adapter you will still only have 30 amps available, but everything should work just like you were plugged in to a 30 amp outlet. check Wallmart, they usually have them

Should not be a problem.
It will still be able to supply 50 amps. So just don't go crazy plugging in electrical appliances or you will trip a breaker in your rig.

The adapter is a good thing to carry.

In heavy used parks, the 30 amp outlet can be worn.

It that case, we use the 50 amp outlet with the adapter.

50 AMP is the draw capacity of the outlet and not related to the power coming out. A 220v outlet would be a different matter.

We have come across RV parks that only had 50 amp receptacles so we needed the adapter. Easy to find at any RV supply source.

Yes, you can.
There are adapters you can buy that adapter a 50 amp plug down to the 30 amp plug that your unit has.