Correct Expression Doubts

i expect u to help me with my english. i have a doubt .

supposing u have 4 brothers

tom
pete
henry
kevin

henry says " i am the third son of my father "


here my point is ..

what's the possible question we can ask to get such an answer ?

i have made some sentences. i don't know whether they are correct.
will u pls check them and correct them? If they r wrong pls let me know abt the correct ones.

pls check the sentences below.

1. what number son are u?

2. what's the ordinal number of yours among ur siblings?
3.what's the chronological number of yours among ur siblings?


i am serious about it
i have seen an ad in a local news paper recently challenging students to find
correct expression and win prices.


I am looking forward to getting a reply from u

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