I don't know about the mom leaving her babies, but I do know an un-neutered male will roam.
Best be, like Jen says, if you don't want more unwanted kittens, trap all of them and get them neutered ASAP. Also, kittens often find homes when placed in shelters, so if you get the kittens trapped, try and get them to a shelter where they can be adopted out. If mom and dad are feral, the best bet is to re-release them after their neutering. Feral cats are quite often put down at shelters because they are hard to adopt out.
Please browse this website thoroughly and you will find advice given to others that will be very helpful in your situation.
However, #1 priority is to get them fixed!
Welcome to PT and please feel free to ask more questions.
Tubby
Spring 1986 - Dec. 11, 2004
RIP Big Boy
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Peanut
Fall 1988 - Jan. 24, 2007
RIP Snotty Girl
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Robin
Fall 1997 - Oct. 6, 2012
RIP Sweet Monkeyhead Girl
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