Joseph Smith, Sr. gave a patriarchal blessing where he said that Sister Rogers can lay her hands on her children's head when her husband is absent.
Joseph Smith Sr., patriarchal blessing to Eda Hollister Rogers, July 14, 1837, Church History Library
Thou must teach thy children all the principles of righteousness and the principles of faith and virtue thou must hold them up in the arms of faith in the absence of thy husband. Thou must pray with thy family when they are sick. Thou shalt lay thy hands on them and they shall recover.
. . .
Sister Rogers will understand that she has something of the priesthood conferred on her for in the absence of her husband she can lay hands on her children. She has formerly belonged to the Campbellites. She must be faithful in talking to them, or as Father Smith called it, preaching to them and some of them shall come into the church.