its hard at times.
i am lucky that my elder two boys who are 12 and 9 are very different so have very different interests and activites, ds1 is into science and maths and computers so he does that kind of stuff after school.
ds2 is sports mad so does football and korfball, ds3 who is 6 (almost 7) goes to tennis and now also to korfball (but ds2 goes twice a week to korfball so there is only once when they go together)
ds4 is only 3 and has pre-school twice a week and then has me to himself with dd whilst the elder 3 are at school, we do stuff at home and the usual stuff like park, toddler groups etc.
dp and i take it in turns to take them out individually.
the elder 2 can fight, this evening they had an argument about when to turn out the light (they share a room) which ended in tears after they started throwing things at each other!
ds2 is currenlty having problems at school, they are wanting to asses him for add/adhd. and unfortunately his brother is and has always been mr perfect behaviour wise, we dont compare them really but other relatives do and i KNOW ds2 i seen as the naughty one :( he is LOVELY but there are some issues :(
interestingly ds3 is an angel at school but we are getting tantrums and tears at home over event he tiniest of things, and a point blank refusual to listen, i have just reinstated the naughty step for him for when he doesnt listen and today he sat and howled as i made him sit there for being mean to his baby sister. time will tell if it works, he has always been very good but there is some extra defiance and stroppiness going on at the moment.
ds4 who i s3, i lovely and cheeky and cute, but also VERY loud and a bit boisterous at times.
dd is the easy one, at 11mths, as long as she can see me she is a happy little thing (as long as i dotn change her nappy or try to get her dressed which results in a screaming fit)
sorry this is long, but i do think that however many you have you will still have issues, i know parents with only one or two who do and struggle just as much.
my boys can and do play together as well as fight and bicker, it really depends on the day tbh and there is no rhyme or reason to it, or that i have noticed anyway!
i just muddle along, try and give them all some one on one time, encourage them to be individuals and i will leave them to get on with some bickering, only stepping in when it gets violent at which point i seperate them and they all get time out, i dont apportion blame, esp if i havent seen it, i just tell them that its not acceptable and give them time out.
oh and i get them all in bed by 7:30-8pm so i can have a bit of 'me' time!