Can I put parents on the lease?

[Heather Schmidtknecht]

I had a young expecting couple view a SFR of mine yesterday. They both have jobs that have been or could be affected by Covid, as they are just at the income level that is 3x the rent amount while working... so I'm a little nervous what will happen if the Covid situation impacts their employment. The young woman's mother accompanied them during the viewing yesterday and has offered to "back" them when I voiced my concerns related to their finances. Can I put the mother, in addition to the young expecting couple, on the lease... thinking that if they don't pay, she will?