I had my brother in-law staying with me and my family a little while back. He showed a bit of interest when I was talking about golf (self confessed golf nut I am). I took him out to the range a few times to have a hit and on one of these occasions I took my whole family (wife, daughter 10, son 7). Daughter was neither here or there. Son started getting into it. Brought him a second hand set for $50 and down the range we went. He loved it. Next time I was going to the range I said I was going to hit a few and before I could finish saying it my son was out of his set, shoes on and grabbing his clubs from the garage.
I say the best way to get them into it would be keep it fun and enjoyable. Don't push them into it.
If it is meant to happen then it will.