For me I tend to handle jealousy fairly badly but head on. I generally don't realize what I'm feeling IS jealousy since I was taught at a very young age to deny what I'm feeling and/or rename it to something acceptable. Usually my jealousy comes out as an all out attack on my guys and their other playmates, which leaves me to make amends and does cause a severe wound in the relationship(s)
We used to fight and blame each other and tap dance around the subject until one day I simply owned up to being jealous which opened up a way to resolve the issue. We could talk to each other like adults, figure out where the disconnect happened and if it was a time management issue deal with it, if it was something more then we could take the time needed to figure out what went wrong.
Generally I'm not a jealous person, which makes things a lot easier for us all. The thing we have learned as a unit is that when one person gets left to feel like the "extra" he/she is going to feel vulnerable, sad, confused and jealous. We tend to own the "blame" equally and we all work to make sure each member feels loved, wanted and appreciated. If jealousy happens after that, then the person who owns it usually will request some time to get to the root of the issue and then approach the rest of the family to discuss boundaries or renegotiation. It sounds all clinical but it's really organic and fluid.
Jealousy makes our family feel as though it is in jeopardy and vulnerable. It is a whole ball of emotions that aren't getting aired and experienced fully. When we know someone in the family is having difficulty we try to circle around and get them comfortable again...that's our way of dealing with it. Still the situation is hard for us living in two countries, one or the other father is always missing his kids and me. For now we just make do the best we can and keep reaching for a resolution.