Do you have birth and death certificates for baby Norman STEPHENS?
Birth place might be a residential address.
Death certificate will have burial place, and cemetery burial record might be under father's name.
If Norman is with Evangeline at 10 months you might think that Evangeline is not living alone.........might be living with Norman's father.
Do you have death certificates for her parents James and Janet, which would identify their children as alive / deceased?
Did James or Janet leave a Will......which might name children as beneficiaries?