For any families that each paid you less than $2,100 for the year (2019), just add up the amount you earned and report it as household employee income. Anyone who paid you less than $2,100 for the year is not required to report anything. You just report the income on your tax return, and it will count as wages for the Earned Income Credit.
If any one family paid you $2,100 or more they are required to issue a W-2 to you. You should contact them and ask them for a W-2. You can refer them to IRS Publication 926, "Household Employer's Tax Guide." They can download the 2019 edition from the following link on the IRS web site.
Publication 926, Household Employer's Tax Guide (2019)
If any employer who paid you $2,100 or more refuses to give you a W-2, you could report the income as household employee income, the same as if it were less than $2,100. You might get an inquiry from the IRS, but it's the employer's responsibility to issue the W-2, not yours. You are reporting the income honestly, the best way that you can.
Keep good records of how much you earned from each employer, and the employers' names and addresses, in case the IRS asks you for more information. Keep those records until April 15, 2023, or 3 years from when you file your tax return, whichever is later.
