Business as usual in healthcare is broken and we've got to do something different. Zeigt, dass das Patentsystem in vielen Bereichen seit langem kaputt ist. Shows that the system has been badly broken in many areas for a long time.
Mumps is a plural noun but treated as a singular noun.
The second use of 'Mum' is capitalized because here you are using the word as her proper name. Capitalization is not related to whether or not a word is abbreviated. You'd also say 'I'm happy for Mother'. The word 'mum' is not a pronoun. Best wishes, Clive.