Answer: See explanation
Explanation:
When babies are given birth to, they can be allowed to sleep on flowers. This is refered to "If we sleep on flowers, its called first night".
On the other hand, when people die, their friends, relatives, family members being flowers to the grave and put the flowers on their graves. This is referred to as "But if flowers sleep on us, its called our last night".
THEY look much better than the others - would be appropriate if you were referring to both a person and an object.
THOSE look much better than the others - would be appropriate if you were referring to an item not a person.
I am not sure but hope this helped.