It is very common to be attracted to a married woman. It's no surprise that men are usually attracted to slightly older women, however, if the woman is also sending you signs of attraction, chances are she wants you to pay attention to her. She wants you to talk to her.
You often praise your sister-in-law's beauty and she would definitely love to hear your praise from you. You have to make him feel special. If you want to make her feel warm, then you should praise her in a way that makes her feel that you want a lot from her.
You must have heard that the one who supports you in times of trouble is your true friend and if we talk about your sister-in-law, then if you support her in times of trouble, she will praise you a lot. Therefore support him in times of trouble. Rest of the time everyone helps but when you help your sister-in-law in trouble, she will definitely love you.
You must have often heard that the best way to make any sister-in-law happy is to make her laugh, so this speculation is always true, it is often seen that if a woman communicates with a man by laughing or a girl communicates with a man by laughing. Does it. A boy laughing.
If she is doing this then we understand that she is his girlfriend because they joke with each other and joking proves that she loves you. Therefore, whenever you get a chance, make fun of your sister-in-law. Make sure and say something joking when you joke with him. It doesn't matter to him that you can even say I love you.