Jake gets jealous, but he doesn't bark or growl. When my grandchildren are over and sitting close to me, he squeezes his little butt right between us and gives us kisses.
He just wants to be part of it all. Sometimes if my hubby and I are sitting on the couch together, Jake will lay across my lap and look at hubby like he's thinking "MY mommy". But, he never gets aggressive and he's not much of a barker. We always just give him extra attention, and then he's fine.