Praise be to Allaah.
When a believer enters Paradise, if his
wife was righteous then she will be his wife in Paradise too. Allaah says
(interpretation of the meaning): “‘And (Eden) Paradise (everlasting
Gardens), which they shall enter and (also) those who acted righteously
from among their fathers, and their wives, and their offspring. And angels
shall enter unto them from every gate…” [al-Ra’d 13:23]. Imaam Ibn
Jareer al-Tabari said in Jaami’ al-Bayaan ‘an Ta’weel Aayi’l-Qur’aan
(16/423): “[In the phrase] those who acted righteously from among their
fathers, and their wives, and their offspring, Allaah, may He be glorified,
is saying that there will be admitted to Paradise those who He describes
as those who (interpretations of the meanings) fulfil the Covenant of
Allaah, those who join that which Allaah has commanded to be joined
[i.e., upholding the ties of kinship] and fear their Lord, and who
remain patient, seeking their Lord’s Countenance, [and] perform al-Salaah
– those who do the deeds mentioned in the three preceding aayaat. Those
who acted righteously from among their fathers, and their wives, and their
offspring refers to their wives, their families and their offspring,
and their ‘righteousness’ is their faith in Allaah and their obedience
to His commands and the commands of His Messenger 
(peace and blessings of Allaah be upon him).”
They will be with their spouses, reclining in the shade of Paradise, filled with the deepest joy. Allaah says (interpretation of the meanings):
“They and their wives will be in pleasant shade, reclining on thrones.” [Yaa-Seen 36:56]
“Enter Paradise, you and your wives, in happiness.” [al-Zukhruf 43:70]
Among the bountiful and abundant blessings that Allaah bestows upon His creation is that if the believers’ offspring follow them in faith, they will be joined with their fathers in the same level of Paradise even if they themselves did not reach that level, so that their fathers may have the joy of seeing their offspring. Allaah says (interpretation of the meaning): “And those who believe and whose offspring follow them in Faith, - to them shall We join their offspring, and We shall not decrease the reward of their deeds in anything…” [al-Toor 52:21]
And Allaah knows best.
