The correct sentence should be:
"Andy's cousin sent him to the store for some wheat bread and milk for their breakfast."
The sentence "Andy's cousin sent him to the store for some wheat bread and milk for there breakfast" contains an error. The error is in the use of "there" instead of "their."
The correction replaces "there" with "their" to indicate possession, as it is the breakfast of Andy's cousin and others.
I hope my answer helped you! If you need more information or help, comment down below and I will be sure to respond if I am online. Have a wonderful rest of your day!
