I have kids and horses and a farm and a wonderful husband.
But… it’s been a work in progress for years, and I had a several year break from horses when my kids were infants and toddlers. I didn’t get back on a horse until my second was 4 years old, and then got back into it with a lot of passion. But it has been challenging.
I didn’t/don’t have a great support system for help with the kids, as we don’t have extended family close by, or who helps with anything really. But I do have a wonderful husband. I have found it easier to keep my horse/horses in partial or full training at various times over the years though, just to keep them going, while family life took priority. You can’t outsource many aspects of parenting, but you definitely can outsource training and exercising a horse.
My kids are teens now and much more self sufficient, and I am much more free to enjoy horses. But… I’m also a stay at home mom, so I have time during the day when kids are at school. If I worked full time and had 2 kids and wanted to ride in the evenings? That would be VERY hard, logistically speaking. There just wouldn’t be enough time or energy in the day for me personally. I’m fortunate as well that my youngest rides too now. It’s nice to do barn time together.
I do know some people who have juggled everything - kids, full time job, and riding competitively. They seem to have more family support which helps in terms of watching kids though, or a nanny, and also have a housekeeper, landscaping service, eat out a lot, etc etc etc. Which is great - good for them. Just make sure when looking at examples of people who are “doing it all” you are realistic about what that means for them, vs what it might mean for you to try and pull off the same thing.
Anyway… realistically, kids change your life. I love mine dearly - they are the best thing that ever happened to me. But being a parent means being present for your kids first… before any other consideration. That’s just my take on it. As others said… be 100% sure that is something you and the DH are prepared for.