Not parent commenter, but what helped me was to track my daily meditations on a big calendar by marking them with an 'X'. My meditations started at 20 minutes. I would listen to some meditative bowl music or rain sounds and set it to end after 20 minutes. Alarms are startling and could ruin a good session.
I also had a little corner of my house with a pillow to sit on. I would change into comfortable sweatpants and pop in my headphones and start just counting my breaths.
