how I react with the attitude of my child to...

Children feel the need for their mother’s presence to always take care of them and they be close to her, and they do not like her to be distracted away from them, no matter how simple things you are busy with are, as they may not understand her constant preoccupation or circumstances. So try to let them know and talk to them about the reasons for your preoccupation and the need for them to cooperate with you, and try to keep them engaged in activities they like, and to arrange and organize their time in what is positive for them. Moreover, you may involve them in activities that are similar to yours but that are suitable for them so that they do not feel surprised when you do those activities, so this makes things more normal for them.