There is justified concern that marriage equality is in danger if Donald Trump appoints Supreme Court Justices who are against marriage equality. It is unlikely that the Supreme Court of the United States would reverse itself and overturn its previous rulings on same-sex marriage. However, unfriendly Justices could begin chipping away at the protections previously granted to same-sex marriages under previous SCOTUS rulings to the point where same-sex marriage exists in name only but not so much in practice.
There is no such thing as child-custody. If you are divorcing with children or have a parenting related legal proceeding the important things to consider are parenting time and the decision-making power over your child’s life.