请教大家一下，关于family unit，我在官网上看是这么计算的：
How to calculate the family size?
The size of the family determines the amount of income you need to make to sponsor. Use this table below to assist you in calculating the size of your family:

1. Count:
   • yourself,
   • your spouse or common-law partner and
   • dependent children, if applicable. See the “Definition of dependent child (types 1 and 2)”
2. Note: Children who meet the definition of a dependent child must be included in the calculation, even if you as a sponsor do not have custody nor provide child support.
3. Count:
   • the number of persons you are now sponsoring and
   • all dependent family members of that person, whether or not they are accompanying.
4. Count the number of persons covered by other valid undertakings you have made or co-signed in the past.
5. If you have a co-signer, count all persons covered by still valid undertakings made or co-signed by your co-signer.
6. Calculate the number of persons covered in steps 1 to 4. The total represents the family size
7. Look at the Federal Income Table for Parents and Grandparents Sponsorship in this guide to help you decide if you have the financial ability to meet sponsorship requirements. Note that your calculations will only be an estimate.

你的全家+你要担保的父母+你已经在担保或者co-signed的父母+你的配偶已经在担保的或者co-signed的父母(如果你的配偶需要co-signed)

这个链接解释是2018年的。而这个问题是问your family unit 。个人感觉是除了被担保的父母以外的人数，因为下一个问题是问你要担保几个人