Mother In Law VS Daughter In Law

Sorry mummies to rant out because I dont have anyone who could understand me. Not even my husband. I have married into this family for 2year 3 month. And blessed with twins 1 boy and 1 girl who already 7 month plus old. Last Feb I have no choice to send my twins to Infant Care at My First School because I have to return to work to support financially. Till now I feel guilty towards them because I unable to be with them whenever they at IFC. So of course when I with them, naturally I want to be 100% there, do all stuff with them. I stay with parents in law. My MIL always complain to my husband that I never let her carry my twins, after that, he always scold me. Like example yesterday, I put my son at rocker, she took him out and carry. I never say anything. I just want to take him away cause I need to feed my son water as he has bad cough and drink less milk. Then at night, I bathing another twin, she ask my husband if I around in the room, because if I not around she able to carry and hold them. I just feel so angry towards her. Im their mother, but I cant decide anything for them.