Tenant move out questions

[Mary Jay]

Hi guys, 

Could you please help me out?

1) Tenant number 1: she is a section 8 and keeps saying: "I might move out in the end of April, unless I cant find any other rental. If I dont find any other rental I will stay". She added 2 babies who are her grandkids. 

I am thinking, its not fair to keep me in a limbo like that, right?  

2) Tenant number 2: He is building a house and he was supposed to move out in the end of March, he said the house is not built and I let him stay one more month. So I texted him today reminding him to move out in the end of April, he is saying that the builder is saying his house will be finished sometimes in May.

During summer its hard to move in Phoenix in a 100F ... 

He has been an excellent tenant, what do I do? Let him stay till the end of May?

What do you guys think?