We share a cause. It wasn't always like that, however. When our son was in college, our teenage daughter at home challenged us over clothes, curfews, homework, and rules in general. Then something happened. I am certain that nothing brings a family together more than caring for animals in need.
Emotional involvement can teach.
One doesn't inherit compassion, kindness, or awareness of other's needs. These things are learned. Everyone who learns them is a better human, and young humans are capable of learning their lessons well. It was my daughter who convinced me to rescue our first paraplegic rabbit. Fostering is not for everyone.