So this is both a question and an idea, which I'm sure might have been thought of before - why can't we make it possible to adopt a child with just one family member?
You could still keep the requirement for marriage, if you'd like, but it's hard on people who really want to have children and can't because their spouse had to take a break/left inexplicably/etc. and they don't want to have to divorce their spouse, start from scratch, and potentially run into the same situation.
I think I've seen it done in Imperian, where you can have just one parent - couldn't we make it a thing here too, with a potential to recognize the other spouse as the parent as well/if they return? Naturally the child would take on the name of whomever is adopting them, still could have the same time constraints, etc. Unless it's a question of it screwing up the family trees?
"You are so much bigger than you think you are," She says, fervently. "You are a beacon of hope that shines through the world with every step you take. You are My beacon, Gabriella, and you shine even into the darkest of nightmares."
The air sparkles with silver motes of light as a silken voice says, "You will see growth and strength where others will see weakness. You will walk with Us as a paragon of Serenwilde's power, for you have already walked this path before."