That'd be crazy LMAO
As disgusting as it is, yes thats prolly it. Thata why they slept in diff rooms and never had their marriage cert registered
A plot twist might be that the marriage is registered but between the FL and stepfather. I dont know if thats possible but wouldnt shock me.
The mother is too frail for sexual intercourse because shes sick with an illness. Thats another reason why the grandfather pairing the mother for the arranged marriage was not appropriate.
Her mum probably sold her to that guy