Seems like a complicated situation.
It seems that your relationship with your wife has broken down and you are only trying to get the kids back, and unfortunately for you the kids come with the mother.
The only way to resolve the situation is to go to your FIL's house and to discuss the issue with your wife and her parents. They will want to be convinced for the sake of their daughter that you will change and their daughter will be happy presumably, before they let her come back. However this interaction should be a two way process where you should also highlight the shortcomings of your wife andask her to mend her ways as well.
Hopefully if everyone approaches the situation with an open mind and is prepared to change and compromise then it should be able for you to get back together again.
My concern is that you have lost confidence in your wife and it can be very difficult to rebuild it again. I can see that you love your children and want to get together for their sake, but it might be difficult for you to rebuild your relationship with your wife (given your existing frame of mind) and in that case it would be better to bite the bullet and to start your life afresh rather than to have wasted a few years only to be back to this same situation in the future. Instead of focusing on the children you need to focus on your relationship with your wife and whether you can make it work.
I am married having two kids ..wife left my home after some fight between us and not willing to come back .I tried many ways that she come back but she is not..but i didn’t go to in laws home to bring her back..actually I have no problem to go there but she never answer any of my effort we are living alone outside Pakistan and she left to Pakistan..
Now the fight is no more between me & wife it become between fight between two families..blame game start from both side..
To be honest I don’t have any value remain for my wife..but as a mother of my kids I am ready to accept her..I told to my wife/my in laws that as a result of all this ,the only loser will be my kids...she knows that I love my kids she is trying to black mail me for her sick plans and demand ..
I heard from some common relatives (may be not true) that my father in laws is asking about separate home in Pakistan near in-laws home + cut my ties with my family(parents) + financial support (may be) + asking me to move to Pakistan ,
if I analyze her attitude with me /with my parents I always think that whatever she is doing in all well planned
when I asked my wife/in laws why she is not coming back they say come here and then talk..
Me, My parents are in tension cause of all this. My father is asking me to go to Pakistan and try to solve issue as a last option, he is saying accept what they are asking ,it will save your home.
I don’t know what to do now..whether to go there or not? if i go what should i accept?
hopefully she got agree to comeback and all things got settled, otherwise I don’t where should I go child custody ,2nd marriage ..
there will be many person who are aware to these sort of problem..I am looking for sincere advice ..for me the life of my kids is the most important .
do pray for me at least ..