I need your advice pls

I am a married woman. I married my husband, a secondary school teacher in 2014.
I brought my brother and sister to stay with us. My husband sponsored them in secondary school. Now they want to go to college. 
My young sister wants to do a degree in Pharmacy & my young brother wants to do Law. My young sister was inspired by our elder sister who is a pharmacist.

And my young brother was inspired by our elder brother who is a lawyer.  
The issue is that my husband is telling my siblings to do a Diploma in primary teaching. He is saying that it's what he can afford.

I told him that my siblings can't do a cheap and useless course like Diploma in primary teaching. My siblings are also refusing. Even my family can't accept such mockery. I don't know maybe he is jealous.

We've been quarrelling over this issue. I am puzzled right now. I am on the crossroads. He is refusing as if he will be paying every month but it is per semester.

Maybe he is doing this simply because I am not working and my siblings may be better than him.

What should I do? I will be grateful for your advice..

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