Understanding「実母なんて10人も兄弟いるのに、誰一人と仲良くないし、誰の連絡先も知らないよ。」

Question

I am trying to understand

実母なんて10人も兄弟いるのに、誰一人と仲良くないし、誰の連絡先も知らないよ。

and have broken it into pieces:

実母なんて10人も兄弟いるのに

1. Which reading of 人 is here being used? Is 人 here being used as a counter?

2. Are there any implicit particles being dropped after 10人 or 兄弟?

誰一人と仲良くないし

3. Is し being used here as a conjunctive?

4. Why is と being used after 誰一人?

5. Is a good translation of this clause something like: "there doesn't exist a single friendly person"?

誰の連絡先も知らないよ

6. Is there an implicit を particle being dropped here after 誰の連絡先 (since there is a も), since 知らない is a transitive verb and 誰の連絡先 is the direct object of this?

Answer 1

1. にん. It's a counter. も indicates 10 is a big number ("as many as 10").
2. Nothing is omitted after 10人 (も is explicitly there). が is omitted after 兄弟.
3. Yes, it's basically "and", but has a nuance of "moreoever" or "what's worse/more".
4. This と after 誰一人 is "with". AはBと仲が良い means "A is in good terms with B" or "A gets along with B". I believe も is missing after 誰一人と.
5. A literal translation would be "(my true mother) is not in good terms with anyone".
6. Yes, (interrogative +) も (+ ～ない) works by replacing を and が, but it doesn't replace other particles like と, に, へ and から. Compare:
   • 何も買わない。
     I'll buy nothing.
     _{(も has replaced を)}
   • どこへも行かない。
     I'll go nowhere.
     _{(も follows へ)}

実母なんて10人も兄弟(が)いるのに、誰一人とも仲良くないし、誰の連絡先も知らないよ。
My (real) mother has (as many as) 10 siblings, but she gets along with no one (of them) and (what's worse) knows the contact information of no one.