Possible Clues:

• Mother's mother, informally
• Great: Sp
• Relative has half of 15 daughter lost
• The Cardigans: "___ Turismo"
• Slight reduction in financial aid is relative
• Relative (colloq.)
• GTO starter
• Relative returning from southern Argentina
• Allotment would be slightly too much for this old lady
• ... Canaria in the Atlantic Ocean