Golf lessons for 4 yr old

Most kids 4-5 yrs have very short attention span. I try not to do more than 15 mins of swings, chipping or putting at a time. Btw I have a 4 yr old boy (started mugging with clubs @ the range), 8 & 13 yr old girls (35 & 7 h'cap).

I'm trying different ways on them to get them self motivated. Beware that it takes a lot of time, commitment & $$$. Not sure if it's worth it.