Male Siblings

by BvonC
(FL Gulf Coast)

I found 2 male GP puppies in a box by the side of the highway a month ago. I took them to the vet and other than being infested with fleas and underweight they are in good health (the vet believes they were 9 weeks old then so 12 weeks old now). They are both dong very well. I had a Pyr mix (GP/Lab mix) that we adopted from a shelter when she was about 8 weeks old; she was the most amazing pup and we were heartbroken when she passed away over Xmas at 14 years of age. We currently have a super sweet 2-year-old spayed female Saint Bernard (rescued when she was about 9 weeks old from an unfit home) who loves the pups.
The pups are doing very well and after 1 week we decided to keep 1 (the one with similar temperament as our Pyr mix) and rehome the other. I found what seemed to be a good home for him, but he was returned this past weekend because the people didn’t realize puppies were such hard work. I’ve found 2 more homes (1 is my neighbor and another is my groomer who has an older GP and a small ranch). My husband and children do not want to rehome the puppy (my 9-year-old offered to give me all of the money in his savings account to keep him), but I’m concerned due to the fact that they are both males. I will be neutering as soon as my vet recommends (whether or not I keep only 1 or both). I have started feeding and training them separately and they are being crated in a divided 52” crate (I will buy another 52” crate should we keep the second pup). I work from home (unless I have a meeting), walk all 3 2-3 times a day, a 1/2 acre 6’ fenced in yard, and a good-size home. The pups are fine without one another, but do enjoy playing (& wrestling) together. The one we are definitely keeping is very social, has bonded with my Saint (& me), and loves being with us. The second pup is reserved, more submissive to the first pup, slower to join the family (it could be bcs he was separated from us for a couple of weeks), and absolutely adores my younger son (they have similar personalities). I am also working on regaining his trust because I think something happened with the family (I had taught him to sit with a hand gesture during his first week, but now he ducks and hides when he sees me raise my hand) :-(
BIG question is- Is it possible for these 2 male (future neutered) siblings to live in peace? I am concerned about potential issues where someone (human or canine) might inadvertently be injured. Please advise. My head tells me to rehome, but I know it will break my family’s (& my) heart. Thank you in advance!
FYI...my Pyr mix was a therapy dog and we visited nursing homes; I had planned on doing the same with the first puppy. I have to see what happens with the second.