I only know Portuguese, Spanish and Catalan to have a word for a child's godfather in relation to a parent (compadre/compare) and a word for a child's godmother in relation to a parent (comadre/comare). This is how it works: (Pt)Este é o meu compadre./(Sp)Este es mi compadre./(Ca)Aquest és el meu compare. = This is my "compadre/compare". (He baptized my child). (Pt)Esta é a minha comadre./(Sp)Esta es mi comadre./(Ca)Aquesta és la meva comare. = This is my "comadre/comare". (She baptized my child). Italian and French have cognate words, but they don't have the same application. Does your language have such a word?