I have two players who have each taken a 15 point obligation (Responsible) for each other. I don't want to ban it outright as I find the idea of two characters dedicated to each other to be endearing, but I am having trouble coming up with scenarios in which one player feels compelled to go out of their way to "take care" of the other with a noticeable detriment to the other player. I am considering just group their obligation into a 30 point (bad things happen to you two) obligation.
For reference, the players are a Father and Son. The father is playing a Bothan doctor and the son is a Wookie Scout.