confusion on basebaths

[steveshane67]

first time posting here and wanted to know what the proper call/rule is

bases loaded, 1 out.

batter hits a line drive to CF, all runners are tagging up. the LCF makes a diving catch, the umpire calls out "catch", the batter doesnt hear the ump and proceeds to run full speed all the way to 2nd, and passes R1, who was tagging up on the play, as the BR passed 1st.

confused yet? this is where the question comes in. now the BR is about 15' in front of R1, both are going from 1st towards 2nd. the ump yells "the batter is out" again, again the BR claims to not hear the ump. the LCF throws the ball to 2nd, the 2B tries to tag R1, but the BR had slid into the 2B and "knocked him out of the way", thus allowing R1 to reach second base. (note, just for extra measure, when both the BR and R1 were standing on 2nd, the 2B tagged R1, who physically was the subsequent runner)

in the mean time, R3 tagged and scored on the play b4 any of the fiasco at 2nd occured.

whats the ruling on the field?

is it just 1 out for the catch?
2 outs, batter is out and the runner closest to home is out for interference (or obstruction i forget which one is on the runner), thus no runs score
2 outs batter is out and R1 is out bc BR interfered with 2B not allowing him to tag R1, and R3's run is upheld?

basically this comes down to what is the BR allowed or not allowed to do when they are retired? and what is the runner allowed or not allowed to do when they pass another runner? (just asking in case the LCF didnt make the catch)

thanks for any help