#you can add bonnie in the mix too! they're a growing child. siffrin gets to watch them grow older and become an adult

[akemiiya]

I'm a fan of the idea that siffrin had a younger sibling. he has a soft spot for children in canon, he would've loved a younger sibling to bits.

it would hurt so bad if he ever remembered or found out about it-- as the older sibling, they would've been responsible for their baby sibling! they should've been there to help them out with their homework, and have fun with them, and mess around with them, and... it feels like he got robbed! it feels like he robbed his baby sibling!

and since they left the island as a teen, and they're in their late 20s now-- it's highly probable that this baby sibling would already be an adult as well. they went through all of these huge life milestones and siffrin was there for none of them. he never got to watch them grow up, never got to grow up alongside them... and, even if they ever did get to meet again one day, that sibling probably wouldn't remember him... not because of universe memory stuff like sif, but because he simply wasn't there for his sibling when they needed him. depending on the age gap, they could've left home when their baby sibling was too young to remember them. and that just hurts.