UK, Ireland / Inheritance Law in Poland and debts - how does it affect a British child? [27]

Pretty much similar situation. i am polish my husband is British. child 4 year old british citizen. My moms cousin passed away with big debt. loads of family members being summoned to pay it and all are rejecting the inheritance. i myself did it 2 weeks ago. now im worried about my child as i have no clue how to do it. i would appreciate any help. emiklaa@yahoo co.uk