Hi thanks very much for the speedy response and everything is very helpful
Apologies as I might have mixed up the letters I got from INZ between my Mother and Father, the 1st July deadline was from my Mothers letter as they were asking for further tests that needed cultures that weeks to complete thats why they've given enough time to complete that.
I guess they are treating both applications separately even if they are applied as my Mother being primary and Father secondary.
The case for my Father, as far as I understood is that we need to show evidence of booking on April 11th 2019 otherwise they will decide an outcome for his visa application based on the information at hand, and will be most likely not in our favor.
I agree that the tests they were asking are quite a bit zealous as I understand it, while my Father is a temporary visitor and I also signed a sponsorship form that I will cover all medical, food, accommodation expenses and also emergency events.
I also don't believe that funding is the case as I've shown more than enough proof of my capacity to shoulder their expenses.