Players being kicked from sever

I play on an iphone, my family members play on Nintendo and Android. While we play I have been using texturepacks that they do not have. So they would download the texturepack and join me. Well after awhile it started kicking them off over and over. I made sure we all were using wifi only. I made sure everyone was up to date. I even went to the extent of buying all of us the same texturepack. It still kicks them from our sever each time they try to join me.