Rejecting prospective tenant requesting for showing

[Haiyang A.]

I was wondering if anyone could give me some advice on tenant screening?

According to phone screening, a couple is legally separated (although they say they are working on reconciliation). Wife and kids will be primary residents in the rental unit, but the wife currently has no income. Husband seems to be able to qualify. However, if the husband stops paying (he said he's not staying in the unit most of the time), I will most likely end up with an eviction. Also, wife asks to move in ASAP, which is a red flag.

How do you say no to prospective tenants requesting for showing for a rental property?