Needs help from learned lawyers regarding family matter

Pl. go through the case history and suggest --- Case 1 - U/sec - 13(1)(a) of Hindu Marriage Act 1955 The husband filled an application against her wife. The judgement was exparte in favour of husband and marriage dissolved by a decree of divorce. The wife never appeared in the court. Wife left the house of the husband and started living separately. Case 2 -- U/sec - 10 of Guardian and Wards Act 1890 Husband filled an application against her wife regarding the custody of their minor children. Mother gave NOC and the custody of the children was given to the father with visiting rights to mother twice a month. Mother visits the children and father has no objection. Now the husband and wife wants reunion. They wants to live together for the rest part of their life. They both mutually agreed to live together without any issues. As they have been divorced by the court of law, how is the reunioun possible. They want the divorce decree and guardianship judgement cancelled. Under which section of which Act can the application be filled and in which court. Are there any judgements in such kind of matter. Pl. mention.