What a sad position for this young man to be in at home. It sure doesn't sound healthy, supportive etc. Great news that he is determined to go to college and from the sound of it, the sooner the better. SM must have hear head in the sand (or somewhere!) to think it is normal to prevent a 17 year old boy from having a girlfriend. And she must be naive if she thinks that sex can only happen if left unattended in a g/f's house. Teens who want to take that step find ways to do it, and I find it hard to believe this woman doesn't realize this. It is not rocket science.
What hateful statements aimed at this young fella by his family. To imply he's not going to amount to anything or whatever, when from all you say he's ambitious, has a good work ethic, concrete goals, is a attentive student, well rounded via athletics etc. He will thrive on his own since he's managing to fly in the face of the criticism even whilst living among those who shoot him down.
We all know most teen romances don't turn long lasting, but this sounds like a great intro relationship for Jumper. She has chosen someone with characteristics that we want our children to seek in a partner. Then again, some teen romances do bloom into permanent relationships. He sounds a good catch either way. Your Jumper must be a great girl to have him so interested in her. Something tells me that both J and Jumper are going to deal with this in a way that works for them both.