Tough situations in mixed religion marriages. As we learn, it’s almost always about how one spouse respects the other and not really due to the difference in theology.
To affirm, one parent is needed. Both parents are a bonus, but requires just one.
In my dioceses, the requirements for First Reconciliation and First Eucharist is defined within a sacrament preparation program. The requirements are that the child be at least 7 years of age, have been in Continuing Catholic Education for at least 2 consecutive years, baptism certificate, and attend Mass weekly.
As my children attend an accredited Catholic grade school, the CCE requirement is waived because they get their religion classes in school. Though, I do have to register and there is a take-home sacrament prep workbook (mine is the purple one).
The first part is the Reconciliation, it will finish with a retreat at my parish and a celebration. The sacrament of reconciliation will then be complete and the child can go to confession at any time thereafter.
The second part is in the spring and is for the Eucharist. Same thing, study at home, retreat at the parish, then the sacrament is formalized (a special satruday mass with all the little kiddos in their cute white dresses and suits).
The time for sacrament prep and faith formation classes is now for the most part. Most dioceses have a fall/winter and winter/spring sessions. The pastor of your parish will definitely be able to help, but most pastors are overworked, stretched thin, or just very busy. You may have better luck getting your sacrament prep going by contacting the Faith Formation department. Do it now as the time may run short, in my Parish, you get credit for attending CCE if you show up at least 70% of the time. We’re already into week 4 of 16, so a late start at 5 weeks barely gets you the attendance but you can’t miss another class for both semesters … that kind of thing.
Best of luck, it is so much easier to get a child to understand the Real Presence than it is to debate with a Protestant who, as a child, has been taught that Jesus did not leave anything behind for us to remember his sacrifice and that the Catholics are corrupt and crazy (not all Protestants hold this anti-catholic stance, but many do).