Baby puree

Hi all My baby 8 months old refused to eat veggies + rice / cereal. He will only it when theres fruit puree added to it. Is this okay to mix both veggies and fruit into his porridge? I feel so stressed because my mil keep saying to just force feed him with veggies only in his porridge. I tried to give him just that but he will vomit and will cry. End up won’t eat at all. Only when i add in a little fruit puree to his porridge, he will eat.