Fix weird results from older siblings less than two years above legality

src/markets/specificMarkets/householdLiquidator.js

@@ -9,7 +9,10 @@ App.Markets["Household Liquidator"] = function() {
 	const _newSlaves = [];
 	let _totalCost;
 	if (jsRandom(1, 100) > 50) {
-		slave = GenerateNewSlave(null, {disableDisability: 1});
+		// Old enough to have a younger sibling who can be a slave.
+		slave = GenerateNewSlave(null, {
+			minAge: (V.minimumSlaveAge + 2), disableDisability: 1
+		});
 		finishSlave();
 		setMissingParents(slave);