Sir Henry Alexander Webb, I - Several consistency issues with family

I think there are too many children also and I think that may be part if not the entire problem.

Consistency Check:
Ann Wilson born after the death of her mother Grace Webb.
Alexander Webb born after the death of his mother Grace Webb.
Robert Webb born after the death of his mother Grace Webb.
Margaret Webb born after the death of her mother Grace Webb.
Ann Wilson born after the death of her father Sir Henry Alexander Webb, I.
Alexander Webb born after the death of his father Sir Henry Alexander Webb, I.
Robert Webb born after the death of his father Sir Henry Alexander Webb, I.
Margaret Webb born after the death of her father Sir Henry Alexander Webb, I.
Birth date of Richard Webb and his brother William Micajah Webb are within 8 months.
Richard Webb born after the death of his father Sir Alexander Webb, I.
William Webb born after the death of his father Sir Alexander Webb, I.
William Micajah Webb born after the death of his father Sir Alexander Webb, I.