When parents co-sign a mortgage to help their adult children buy their first home 2004 2004 2025 2025 2022Q4 2022Q4 Borrowers without parental co-signing Borrowers without parental co-signing Borrowers with parental co-signing Borrowers with parental co-signing 4.0010.90 4.1013.80 7.3013.40 2.9011.50 4.7010.20 787000.00 709000.00 458000.00 0.800.82 0.801.19 0.801.62 0.802.32