Introducing a New Spouse to Your Children
Children generally need a slower pace than the adults in a new relationship. Waiting until things are truly serious before introducing a new spouse, and then continuing gradually rather than expecting immediate closeness, protects children from instability that has nothing to do with them.
Wait until it's truly serious
Introducing children to someone before a relationship is likely to lead to marriage risks attaching them to someone who may not remain part of their life. Waiting until the relationship is clearly heading toward nikah reduces that risk substantially.
Go gradually, not all at once
A first meeting in a low-pressure setting, followed by more time together as comfort builds, tends to go better than an immediate expectation of closeness. Children adjusting at their own pace isn't a sign of a problem.
Don't force affection
Requiring children to express warmth they don't yet feel tends to create resentment rather than genuine connection. Respect for the relationship, and basic good behaviour, are reasonable to expect; real affection develops on its own timeline.
Keep the parent-child relationship visibly secure
Children often worry, even silently, that a new spouse means less attention or love from their parent. Making time for the existing parent-child relationship to continue clearly and visibly helps ease that fear more than reassurance in words alone.