Girls, can anyone tell me if they've encountered something like this o…

Girls, can anyone tell me if they've encountered something like this or know how child benefits are calculated in St. Petersburg, if the child has a registration in another city, and I'm registered in Leningrad Oblast. Can I get St. Petersburg supplements on the "Children's" card? Or do I need for my child's registration to be in the same place as mine? Our father is registered in another city. I wanted to register his registration.