Advice please?

Hello everyone I hope everyone is having a good morning.

I been married with my husband for a year. We dated for 4 years. I have pcos and TTC hasn’t been very kind so we decided to start saving for IVF. I’m a part-time employee and full-student trying to earn degree in veterinary.He’s a full- time employee. We have a little business that I started with breeding Australia shepherds for service and training.My husband family had made fun of me and told me I used dogs to pay my rent etc.. which it absolutely not true. Lately my husband younger siblings have been manipulated him to buy them clothes, food, and gifts. I understand sometimes life is hard but I feel like I’m being used for my hard money that I earn I hardly buy myself accessories because my needs comes first bills,dog supplies, training, gas, etc. I believe that it’s his mother and stepfather duty to provide their children needs.