Well, after seeing that post, I simply couldn't stop thinking about the possibilities, and I may have exaggerated a bit, but I was still quite happy with the final result :)
Josephine married Bobby and had five children with him - I like the idea of Robert having a fairly large extended family, and it's from her that Robert has freckles, and I love the headcanon that Robert looks a lot like Bobby physically
Robbie is the middle child of triplets; Rebecca is the oldest and Rowan is the youngest. Two years later, Peter and Noelle joined the family
For a few years, they all had normal childhoods, but after they grew old enough to understand that their father was a hero, Bobby began to feel superior to his brothers—since he had the same name as his father, he also inherited the mantle of Mecha-Man in his mind. Bobby and Josephine didn't want their son to think that way, but no matter how hard they tried, Robbie couldn't shake the idea from his head
Years passed and the relationship between the brothers deteriorated rapidly, to the point where they didn't speak to each other at family gatherings and constantly argued. After Bobby's death and the emergence of Mecha-Man Astral, they had practically no contact with Robbie, only on rare occasions while they took turns caring for their sick mother
Then, after a few more years, Robbie showed up with baby Robert. All the siblings fell in love with him immediately. Rebecca and Rowan babysat when Robbie was being Mecha-Man, Peter was always around to help, and Noelle loved playing with him - all of them, except Peter, already had partners at that time, and some already had children - They are willing to help take care of little Robert - even though they didn't forgive Robbie for everything he did, they still loved their nephew unconditionally. Then, when Robert turned 5, Robbie picked him up one night and never came back
They then received a letter/message that Robbie was moving and cutting off contact with all of them, as he saw them as potential threats to the Mecha-Man legacy, so he could train Robert "properly"
The siblings searched everywhere for them and tried to take legal action, but were unsuccessful, leaving them with no choice but to wait and hope for the best
They still saw the news, they saw Mecha-Man Astral die, and they have mixed feelings about it
They saw Mecha-Man Blue spring into action - which is not easy for any of them - and god, when they saw him fall from the sky? They were devastated
Until finally, after so many years, Peter managed to get in touch with Robert. Peter had gone alone; he didn't want to scare his nephew or overwhelm him
The two had a long conversation in a restaurant near the SDN, and Peter gave Robert his phone number, just in case he wanted to contact the rest of the family
I don't know if I'll make a part 2 of this but if I do, it will be in another post because this is already too long
I still have to talk about Robert's cousins! I still don't know if I should make a post for each family or if I should do everything in one post, tell me what you prefer!