LL 9-10, 2 simple?? questions.

[t2nyval]

I umpire Little League 9-10 in Ohio. Tonight there were 2 situations I wasn't completely sure of. Your clarification will help.
1) Infield fly that is not caught or touched, it hits the ground. R1 stays put. R2 leaves early and the base is tagged by a fielder who picked up the ball...he's out, thats easy. R3 waits for the ball to hit the ground and goes home. I call him safe. Did I make the right call on R3 or is the ball dead if noone catches it or touches it?

2) Bases loaded: Dribbler hit to F3, he fields it and he and BR collide at first with BR being called out. The collision causes the ball to fly about 20 feet away. All 3 runners who were on base score. I called them safe, Coach wanted runner interference called. What about this call? Thank you in advance.