Hi!
1) You will only need one IMM5563E form to be filled for whole family. In that put your details in first row if you are principal applicant like ( family name, given name, date of birth and tick consent included). In 2nd,3rd,4th row put details of all your dependents like your wife and children and put their details like their family name, given name, dob. Tick the box consent included for your wife as she is over 18 and her consent is also included but do not tick the box consent included for your children because they are under 18 years of age and their consent is not needed.
2) You will need two IMM5475 forms, one from you and other from your wife because she is also included in your application. Your wife will sign the bottom of your consent form where it says signature of spouse and you will sign the bottom of her consent form where it says signature of spouse. But as your children are under 18 so their consent is not required.
Thanks