Leo is listed in the 1910 census living with his parents & siblings (Arthur, Francis, Mamie, Albin, & Eugene) on Loomis Ave.
After that I found a record for a Leo Lesso (a)rd in the 1940 census age 41 listed as an Elgin State Hospital patient, previous home Cicero, Il. , I do not know if this is him, but I can find no more listings for him at this time. All his other siblings & parents were still living in the same area.
