Previous Agreement in all the names of the family now wants in mums name who is on income support

Other

Last year a tenancy agreement was done with all the names of the family members who resided in the house (Mother, father, 2 daughters and son) All except the son are over 18 years. They now want to renew the agreement in mums name only. I understand she is on income support. Are there any pitfalls if I do that or should I just leave the previous agreement to roll on? What is the best thing I should do? Your assistance in this matter is much appreciated.