Miquel Utrillo in Morlius (Barcelona, February 16, 1862 - Sitges, January 20, 1934) was a Spanish engineer, painter and art critic from Catalonia.... Miquel Utrillo became friends with Valadon during his stay and in 1891 adopted her son Maurice, who later gained great fame as a painter. (Google translation of text at https://nl.wikipedia.org/wiki/Miquel_Utrillo_i_Morlius). Another site says "Miguel Utrillo only admitted paternity eight years after Maurice’s birth." (http://www.safran-arts.com/42day/art/art4dec/art1225.html)