<human>: Greetings. I am a legal guardian of a 17 year old teenager (call them jack). We live in Florida, but the issue at hand lies in Pennsylvania. We obtained legal guardianship of this person because she was abandoned by her biological parent(dad is alive but useless and mother passed in 2005). We are not blood relatives but the courts have awarded guardianship to us 5 months ago. 

The issue. We are back at the teen's hometown and they want to see a younger brother who still lives with the biological parent. This parent is skeevy and plays games. If Jack goes to the biological fathers residence, can he be "forced" to stay, preventing them from coming back with me?
A concern is that if jack goes on the property then the biological father can say "that's my kid and they cannot leave" regardless of guardianship papers that I have. 

More details if needed.

Summarize the given text in a few sentences.
<bot>: Can PA Bio father force their kid they abandoned to stay with them despite me having legal guardianship of the child if "Jack" goes to their house to see his little bro in PA?