Go out and wash the car with him occasionally.  He may not need your help in washing that car because why would he, it is a man’s job in the first place.  But he would surely appreciate the company.  Kid around with him while you help him wash his car.  Do the simple things like holding the hose for him or any of the easy stuff.   Make sure that you are helping and not be a burden. If not washing the car, try joining him as he do some house carpentry like fixing plumbs or something.  Just handing him the screws would be appreciated much.   You may join him with this activity but make it not too often or he would get annoyed.  And never expect him to say thank you after because greater chances is he won’t.