Breastfeeding FOREVER!!

Ami • Follower of Christ, married and pregnant with 4th baby!
I am a mother of 3. I have breastfed all of my children. In fact, I am still breastfeeding my 2 1/2 year old.
​I love how good it is for him. He only does it at night, before nap and here & there during the day for a minute or so. 
​I would like him to stop. When I try to refuse, he gets very upset. I can distract him sometimes by reminding him about his sippy cup but when he is tired, that's what he wants.
​Any other mom's who have been in this situation and have other options that have worked... Bring it! ??