Faulty parallelism is a construction in which two or more parts of a sentence are roughly equivalent in meaning but not parallel (or grammatically similar) in form. Faulty parallelism most often occurs with paired constructions and items in a series.
Answer:
Hi Uncle,
I sincerely appreciate the opportunity you give me, but I can not attend. I'm am currently on lock down orders and if I leave it will be very difficult to come back.
Love your, Nephew or (insert name here)