Claiming dependent on stimulus

I want to make sure I have correct information on claiming a dependent on your stimulus/recovery rebate credit.  I live with my mother in law my twins have lived with her so she claims them on her tax returns, which I am ok with because at that time she was supporting them. My question is I moved in with her a year ago to help take care of my kids, they are listed on my government benefits, I am disabled, therefore I do not normally file taxes, but this year I did for the simple fact I did not receive the total stimulus. I did list my kids for that and only that because I do take care of them with their food, clothes transportation whatever they need. I did not claim them pre say on my tax return just for the stimulus. My mother in law said I messed her up on her taxes could this be true. We both support them live under the same roof?