Sadly enough, when a relationship comes to an end, the same people who stood up for marriage equality may use unfair laws against their former spouse. This is really common in custody disputes involving LGBT couples. If you can team up to create a parenting plan with your spouse, then you could prevent a lot of pain and trouble.
A lot of LGBT couples have decided to begin their own family before marriage equality, and without a legally celebrated and acknowledged relationship. As a result, some found it almost impossible to adopt one's biological children. If the other parent did not get the chance to legally adopt the children, the courts will not bestow any parental rights over that spouse.