I would look at it this way: if it's something you love to do and extra money would be a bonus, I say go for it but let the employer know you on taking on quite a bit and see it there is any flexibility to the job persay....
As for the family, I have begun the gigantic shift from making THEM happy all the time to making ME happy now....after almost 31 years of kids and marriage and mom taking the back seat, they are now grown, I have free time on my hands I never knew before so if something comes that I love doing, they will have to adjust.....
May sound selfish but the amount of time I invested in running the family home had me sacrificing things I wanted to do for the sake of the family...I know, they don't prescribe that but in "my day",, that's how it was done. And now it is my time....
Go for it and good luck...maybe they will even surprise you and have the house clean and dinner waiting for you (lol I tell my husband, I will consider me dead and in Heaven if I EVER walked in the door with dinner waiting for me......

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Momz