Thanks for coming to Just Answer. What, exactly, is your son looking for? Help with custody, or another legal situation regarding his daughter?
help with custody
Your son lives in MN, so I found this group which gives assistance, including the assistance of some attorneys.
Here are more sites:
For the most part, there are fathers' support groups, but not a lot of ways to get free legal help. He should look into one or more of these groups and talk to some members to find out if they have recommendations for him. Getting legal help is quite important in custody matters.
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