Some distant family members want to see my bump on video

My distant family members especially the jealousy ones like my MIL who always compares me with her daughter and my own sister who is negatively curious has been asking me to show my pregnancy bump on video call.

I hate to go on a video call in general and added to that these specific set of people are asking to show my bump.

What polite reasons should I say to have them not ask me again?

They have been quite insistent and being back of me everytime I talk to them. Please help