Shaykh Yasir Qadhi provides elaborates on the Islamic principle of reconciling broken ties, bonds and kinship as exhibited in verse 63 of Surah Al-Anfal.
A secret group is permitted to be formed to bring good and that which gets the Ajar of Allah:
If one is coming together for a charity
Reconciliation between two fighting people or the one who have severed ties with their kith and kin.
According to a famous Hadith, there is something far better than Sadaqah, Siyam, and Salah and that is bringing those ties of kinship together.
More so, even though lying is Haram in all forms in Islam, it is till permitted to bring two people together who have not been on good terms.