I think it’s highly likely WE the mad crazy neighbours! 6 of us living here, in a three storey mid terrace, 4 dogs, son, 23 has an alternative metal band and sometimes practises his “roars” & “screams” at home. Dogs bark if someone breathes the wrong way!
However, even though the children living at home still (aaaagggghhh) are all adults, they are pretty respectful of neighbours, try to keep dogs quiet, don’t let them out in the garden between 10:30pm-6:15am, no “roaring” or “screaming” between 10:00pm-9:00am or loud WiFi use (gaming, group chats etc) between those hours too, no cooking after 9:30pm - so despite a full house and chaos it’s no more noisy (as a general rule) than smaller households.
Next door to our right is also a house with now only two newly retired people who are very quiet, however next door to our left neighbours are two flats, downstairs is one lady and one very noisy dog who she often leaves in the garden barking for up to half an hour, upstairs is a very mad young lady, with a 5 year old son and three dogs and no direct access to their part of the back garden. She also is a dog sitter? Not sure how! Lots of different dogs coming and going and child shouts and screams a lot, no so bad in winter, but in summer they spend hours and hours in their back garden and it’s horrendous sometimes.