I'm pretty sure it's important to RYAN that his sister approves of his relationship. He loves his siblings so much, I can see it being important.
Ro is kind of fly by the seat of his pants when it comes to this whole relationship thing, and he was about four seconds away from just straight up telling Ryan "Listen. I will marry you tomorrow if it means I don't have to worry about you having the ability to pay for the things you need in life." He DIDN'T, but it was ohsoclose. Now he's just made Ryan agree that he can buy him a computer for Christmas and plan a whole trip for Ry's birthday. Mwahahaha. Devious.
He's also wanting desperately to pay for the family lawyer that Ry needs to try to get Aurora's mother to follow the custody order. Ry wants to have a lawyer that takes payments and Rowan is like 'please just let me take care of it. I swear to god, man' ANOTHER time he was close to just... proposing. XD They haven't even been actually in a relationship for more than a month yet!