Family and neighbours like to compare me with my co-wife. How do I deal with it?

Other people's comparisons say more about their ignorance than about your true worth. You are not obliged to respond or defend yourself every time; a short answer and a change of topic are enough. A woman's honour before Allah is measured by her taqwa (God-consciousness), not by the neighbours' comparisons. Also avoid answering back by comparing yourself as the better one, because that drags you into the same game. Keep close to people who support you, and lend less of your ear to those who like to stir things up. Your worth is not decided by people's tongues. See co-wife relations.