How To Write A Letter For Child Adoption . (mentioned the reason of knowing). Start your letter by specifying your relation to the couple in question. An open letter to my future foster children. fostercare This is from www.pinterest.com The expectation is that the adoptive parents write first at the beginning of the agreed month. An adoption is a serious and person commitment that will extend for the rest of a child’s life. A letter can be faxed or scanned to the home study provider but they must also mail the original to the home study provider for the file.