Male urinating is about 'control' whether standing or sitting.
Sitting down and urinating should not be a major problem......toilet lid will control some of the splashing and having your son 'aim' downward vs straight out will help.
And if some splashing occurs (which can happen sitting/standing) just clean up toilet & floor more frequently. Only takes a few minutes to do a wipe down.
The high profile toilets are more comfortable and more like sitting on a regular toilet vs having ones knees above their head.
I sit because I don't like the splashing that occurs...in my RV, in restrooms etc. (Unless there is a urinal....which I despise due to the 'wet' floor around them)
Is it time for your medication or mine?
2007 DODGE 3500 QC SRW 5.9L CTD In-Bed 'quiet gen'
2007 HitchHiker II 32.5 UKTG 2000W Xantex Inverter
US NAVY------USS Decatur DDG31