I have feet, but no legs. Which animal Am I?

A girl has as many brothers as sisters, but each brother has only half as many brothers as sisters. How many brothers and sisters are there in the family?

Can you convert the number zero(0) into a positive number using just one mathematical operator ?

I am a normal creature, but I have five hands. I can even have more but even then I will be considered normal.

Who am I?

I possess a head

I flaunt a tail

But I don't have mouth or legs

Can you find out who I am?

What does it mean?

Why is 6 afraid of 7?

I am the largest in my family of fifty.
The youngest of our family lives separately from the rest of the family and so do I.
I am regarded as harsh and tough.
I am so large, you cut me in two equal halves,
each half would still be larger than the second largest member of the family.
Who am I?

As a whole I am both
safe and secure.

Behead me and I become
a place of meeting.

Behead me again and I am
the partner of ready.

Restore me, and I become
the domain of beasts.

What am I?

Can you complete the sequence puzzle?

AR TA GE CA LE VI LI _