Question about kids training.

My daughter (11) and son (9) train judo. They have been training since they were 7. She has participated in around 30 judo tournaments, and he has participated in around 10. She lost in the last national judo tournament, and last year she was third (U13) even though the coach did not prepare her at all for neither one, he said she is just child. I have tried to speak with him couple of times but he just started to ignore them and me, not showing interest and dont show any attention to their particular skills in judo and in their physical, he once said to me either you gonna train them or I, so I moved back, He and his coaches though last year had talked to me all the sweet words how my children are all for judo. Now from the club that has 30-40 children he focus on only three children particulary (richer) parents and he watches over. When they go on tournaments they go with private cars, always saying there are much more bad reasons why isnt good for children to go with lets say minibus or something. Last year i was diagnosed with autoimmune hepatitis i trained freestyle wrestling and bjj my whole life, but wanted for them to take part in something new, and it was all good in beginings, but as I cant go with them on tournaments so often even though I wish I could it started to change I feel like its all because of me and my state even though no one hasnt mentioned anything to me.. What do you guys think is it normal thing or is it a time to move on, Im asking particulary because children are losing focus on judo as time goes.