YES, they can be. We try too treat all ours the same. BUT every so often one of the kids will want more than another. My Mit's is very jealous of his brother Peak when it comes to me.Precious want sto beon my lap all the time and will his at anyone that dares to come near me. She starts, I put her down, then the lap will fill with Mit's, Demetri, & Lucky, It makes no differance if thier from the same litter. after 6 months everyone is a new face.