Would being on the mortgage impede my ability to purchase a condo later?

I am buying a townhouse with my elderly father, we will both be on the house as "Joint tenants of survivorship" which means whoever doesnt die first, owns the house completely. I have a choice whether or not I want to be on the mortgage. My question is, if I am put on the mortgage, will that impede my... show more I am buying a townhouse with my elderly father, we will both be on the house as "Joint tenants of survivorship" which means whoever doesnt die first, owns the house completely. I have a choice whether or not I want to be on the mortgage.

My question is, if I am put on the mortgage, will that impede my ability to quality for a loan in 4 years when I buy my own condo? I will have 40k down on the condo, but still owe half of it. I am worried they will not allow me to get the loan for that mortgage if I am already on the first mortgage with my dad at the townhome.

My dad said this isnt true, that I could use the townhome as collateral to get the mortgage loan for the condo. Is this true?
Update: I am in the United States
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