You should each get a letter for half. Did you mean 700 or 7,000? If his letter was for 3,500 that would be half of 7,000. Did you file a Joint return and claim 3 dependents? 1,400 x 5 = 7,000. Check back though your bank statements and check BOTH your accounts at the IRS to see what they say they sent you.
IRS ACCOUNT
https://www.irs.gov/payments/your-online-account
Also don't mix up letters 6475 & 6419? 6475 is for the 3rd Stimulus 1,400 per person
Letter 6419 is for the Advance Child Tax Credit if they sent you any.
