Big Brothers Big Sisters of the Lakes Share: Community Organizations Big Brothers Big Sisters of the Lakes Visit Website 129 S. Lake St. Roscommon, MI 48653 (989) 808-1296 (989) 386-9312 (fax) About Map About One to one mentoring program, serving children ages 5-15. Our office os locaed at 129 S. Lake treet inside North Central Area Credit Union. Please call us today for an appointment at 989-808-1296. What's Nearby? Distance: 5 10 15 20 25 50 mi.