“Offers to settle are inadmissible in subsequent family law proceedings except when dealing with costs issues: see rule 18(8) of the Family Law Rules, O. Reg. 114/99. The same applies to draft minutes of settlement tendered on another party but not signed: Parreira v. Parreira, 2013 ONSC 6595 (CanLII). This rationale extends to a settlement that was agreed upon but could not be implemented. the Family Law Rules, O. Reg. 114/99.”