please tell me the relationship of wife and husband after death of either one
The relationship of husband and wife comes to an end by the death of either spouse. This is why a widow must complete the Iddah period after her husband's death which is 4 months and 10 days. After this Iddah period, the woman will be free to marry another Muslim if she wishes to.
If Allah wants them to meet each other in Jannah and be with each other there then Allah will make it happen.
And Allah knows best.
Mufti Ikram ul Haq
Fatwa Center of America