Yes, they are sinful for this, one must not obey his parents in disobeying Allah.

Someone I know said that her mother often tells her to lie. For example, when one of her mum’s friends calls sometimes her Mum tells her to say she’s not home when she is. And sometimes when her mum’s friend knocks she tells her to say she’s not at home. What should one do in his circumstance? Does the person get sinned for lying?

Sins | October 22, 2017 6:08 pm
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What shud I do if someone ask me about my sinful actions in past for example did u listen to this or watch such and such a thing and its hard to avoid answering them…???And if they ask how did i change from my past, can i say Allah had given hidayah for me, is it like being proud or something…???
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I recently suggested 2 my cousin that her profile pic on WhatsApp was a bit too attractive. I’ve been dropping hints on improving on religion also for some time now. She blocked me in response. Similarly, when I advised my sis-in-law not to go in for the birth control operation, she said she knows it’s haraam but she did it. How best to deal with such relatives who knowingly sin?