They are giving me a headache

My kids are 11 years apart & must love to hear them selves scream @ each other & the dog bark @ them cause he's trying to protect my daughter. Love the fact that they have a very good relationship but my son who is 21 must love to hear his lil sister scream cause he provokes her. They gave me a headache in a matter of a few minutes before I get ready to start screaming I stop myself & think for a few minutes then come to the conclusion that they are screaming out of fun & love not out of fear or pain so I leave them alone and count my blessings.