I don’t like the phrase ‘having it all’, because it has connotations of striving to achieve something unattainable; also it sounds very dated to me, like something people would have talked about a few decades ago
Is it possible to both succeed in decent careers? Yes, absolutely. I think it takes hard work and a real willingness to communicate with your partner honestly and openly; you both need to be prepared to share the tough bits as well as the joys of parenting and home stuff as well as working.
I worked part time for a very short while when the kids were tiny but was full time again by the time our youngest turned 4, and have continued full time ever since - well over 20 years. I’ve been able to gain promotions which I wouldn’t have got had I stayed part time or played second fiddle career-wise to dh. We’ve never had family help either.
I don’t think one career necessarily has to be sacrificed, I just think you need to be prepared to work hard, keep the lines of communication open and regularly review with your partner how things are going so that you’re both happy with things.
My advice is , forget about the meaningless cliche, ‘having it all’ and frame it as ‘is it possible for both of us to be able to continue doing well in our careers?’ Ok it’s not such a neat sound bite but it’s a more realistic description