S.W.
I co-parent my 9 year-old daughter with my ex. Co-parenting does not mean that the child sees both parents every day. The time spent with each parent may not even be equal. To me, co-parenting means cooperative parenting where both parents are equally actively involved in decision-making and caring for the child. In our case, this means equal time with our daughter and equal say in the decisions about her activities and well-being.
Our schedule works like this, this is my time with my daughter:
Week 1: Sun, Mon, Tues, Fri, Sat
Week 2: Tues, Wed
Repeat
We switch on Sunday, mid-day
This has worked well for us since we separated when she was 4 1/2. She does not have an unstable or confusing home life. She absolutely has a sense of home. If you ask her, she will tell you that she has two homes, and two parents. She is allowed to take her things between houses as she chooses. She has pets at both houses, adequate clothing and toys at each house, friends in each neighborhood.
This type of arrangement can, IMO, only work if the parents have a good open relationship. Switching more often and during a school week means that the parents need to be aware of the schedule, homework, outside activities, etc. Both have to share the responsibility for having sports equipment at the right home on the right days, homework in the school backpack, library books back when they need to be, etc.
Her dad and I talk, email, or text almost every day about these details.
In our case, no money (child support) changes hands. We have a joint checking account that we each contribute to monthly according to our incomes and all our daughter's expenses are paid out of that account. We reevaluate periodically to see if we have enough money in there and if our incomes have changed. We discuss larger purchases but the day-to-day things we pay for without needing to check in.
I understand that our relationship is not like many divorced peoples'. My ex's first divorce and aftermath was an almost two decade disaster that damaged my two stepkids (now 29 & 27) lives. There was constant fighting, secrecy, deception, lawyers and court actions. He and I worked together through all this, to do the best we could for the kids. We swore that we would never do that to each other and to our daughter, and we have both abided by this.
Not all divorced couples can have as open and flexible an arrangement as we have. We discuss schedule often, make adjustments for special events, switch days if work or other obligations come up, and don't deny our daughter the chance to be part of extended family events because of some rigid schedule.
To me, this is what co-parenting is. It is putting the child(ren) truly first and acting like adults.