Rent Receipt for Income Tax Exemption



I have below 2 queries:-
1)My landlord has given her wife’s pan card number (rent exceeding 100000). On the rental agreement, it’s landowner’s name. Will there be any problem?
2) I generated rent receipt online, put the landlady (to whom pan card belongs) name as the house owner.
But they stay in a different city so its not feasible to get her signature. Is it ok, if I sign on behalf of her?
Does pan card signature needs to match that of rent receipt signature?