It is normal to want to check on your home.
Mark is vacationing in Florida with his family for a week while his brother looks after his house.
Mark is nervous about being away and wants to calm his mind.
Mark calls his brother to remind him to make sure that his house is secure.
Mark tells himself that everything is fine orders a drink to distract himself from worrying about his house.
Mark's brother realizes he may have forgotten to lock the back door and returns to Mark's house to lock it.
Mark's brother forgets to lock the back door after letting Mark's dogs out and Mark's house is robbed.