Dear Gotta Get What's Due To Me,
The best way to make up for the discrepancy is to be in a position to marry again. Of course, that means going to the trouble of divorcing your current spouse, which means coming up with funds to hire attorneys, therapists, doctors to diagnose abuse (physical, mental, and sexual) in the lives of yourself and your children, detectives to locate any offshore income your spouse is hiding and find ways for you to hide your own income, divvying up the known assets and income, and of course convincing everyone in your life that the divorce is for the best, including the kiddies.
Then you need to find someone to marry, who is willing to accept the kids.
Once you're engaged, it'll all be worth it. And this time, register for the right gifts-and make sure everyone knows about it by putting the registry information in your invitations and on your website.