Dear J.,
Just distract her, and as often as she does, it get her mind on something else, if she does it a second and third time, keep on doing something to get her mind off of it. She will eventually quit and you will be the champion. If you talk to her about it, then you will make it more ingrained in her memory. Just take her hand and sing and song, or clap her hands together, or take her outside to see the birdies, or something fun. You know what I mean. Just do not talk about it to her or with other people when she can hear. Babies are smart - and maybe she will forget or just 'decide' to cooperate. You can only hope for that one.
Also, for the one that has issues. If you and your husband can decide how to handle situations, and do it consistently. It will be very helpful, and will not confuse the child, who is probably already confused by either feelings he has or what ever disability that he may have. Keep taking him to the doctor and asking for advice . He deserves for you to do the best you can to give him a good start on living a comfortable and relaxed and happy life. He is going to be a Dad someday, yes, he will. Give him the skills to do a good job with your grandchildren. No, I am not kidding. C. N.