It sounds like you have a couple of fine young men in your family, and I look forward to hearing about them achieving their goals! (BTW I really liked Rutgers, my son played ball there one summer and my DD liked it so much, she considered applying there, but ultimately stayed in our own state. Both still occasionally wear the gear they bought from there, though!)
Re the bolded. I just wanted to mention this, and hopefully I can explain it right. At one of the open houses at one of our state universities, the dean of the college explained to us that the school is supported by the taxpayers of the state, so it is "our school". He said that he could just about guarantee that every in-state student that applied to early action would be accepted, especially if either their GPA or SAT scores were decent. There are charts that help explain this, and I'm sure someone else here who is more familiar with the concept can probably explain it better. (And I will attempt a link below.) But I just wanted to mention it because even if your son has only recently taken a big leap towards college, there is still hope if his grades aren't stellar by his attempting to do well on standardized testing. You might want to go speak to them at the school and see which standardized test they prefer (ACT or SAT), because, for instance, at our state schools, they said just SATs were fine. (Here on the Dis we hear a lot about the ACT but those seem to be more prominent in other parts of the country than the Northeast.) He'd do well to concentrate on just the one he needs, then get him some help so he can do well on the exam. Tell him I said that he HAS to put the work into that!! It's very important, but a lot of kids don't really get how much so until it starts to sink in that these scores are very important to their getting into school, sometimes even more important than GPA for certain programs. So have him keep up his grades, start getting some help with standardized testing, and plan to apply to your state schools early action. I told some of my friends this at the time and for those who did it, everyone got in, just like the dean had said. (Note, this was not the UMass system, but the state universities, in case anyone is wondering. It's harder to get into the UMass schools.) Oh, and higher test scores can also yield tuition help.
https://blog.prepscholar.com/low-gpa-high-sat-act-what-should-you-do
https://www.powerscore.com/sat/help/sat_vs_gpa.cfm
HTH. Good luck!