wow you revived an old thread.
Anyways, you're correct, as Guru Hargobind Sahib gave his son, Baba Gurditta ji, to become the next leader of the Udasis after Baba Sri Chand.
Also, the line Aad Sach, Jugaad Sach, Haibhi Sach, Nanak hosi bhi sach was entered into Sukhmani Sahib when Guru Arjan...