Tama yun mga advise nila...get a lawyer and file a case for your rights to see your children. WAG MONG BALIKAN si misis. Wala ng manyayari sa marriage na yan. Dapat tuloy mo yun relationship mong isa...pero wag muna kayong mag aanak. Grow a spine...you started it anyway, but both you and your wife are to blame for that.
My parents were separated too when we were young...this I can say from my own experience...your kids will look for you when they grow up, just keep seeing them even for a second at their school...no matter what your STUPID IN LAWS say against you...it can be nullified by simply being there for your kids.
See other women...it's the best solution. Show your wife and STUPID IN LAWS you're happy now, it's the best way to get to their nerves.
Some might ask...why STUPID in laws? Because by not letting you see your children...they are doing more harm to your kids...they only have their interest at hand...which is revenge by making your life miserable...so don't be...GO OUT AND DATE! HAVE FUN! LIVE YOUR LIFE! SHOW THEM YOU'RE HAPPY WITH YOUR DECISION!