S.L.
Hi T.:
Congratulations on the twins! I have a set of boys, now 5 years old, and I nursed them until they were 15 months old. My daughter is 3 years older.
I kept the twins on a feeding schedule, and always made sure to feed them upon awakening, not before they slept. As much as possible I tried to connect meal and snack times for my daughter to the nursing schedule. So, she would be eating while the boys were. I usually grabbed a book or a toy and had her play next to us during feeding times. Another thing was for her to "do my hair" while feedings. Don't worry, you'll do fine once your husband goes back to work. Make sure he gives you some time to yourself once he gets home and on the weekends. If you don't have one, I highly recommend the Medela double pump so you can get out of the house alone longer than two hours.
If you have any more questions, feel free to ask!