These are likely to be all theirs.  From FreeBMD, surname Young, mother's maiden name McMorris.  * indiactes on 1939 Register
									
									
									Surname 	First name(s) 	Mother 	District
									Births Mar 1912   (>99%)
									YOUNG	 George H	 McMorris	 Hartlepool	*
									Births Jun 1914   (>99%)
									YOUNG	 Annie	 McMorris	 Hartlepool	*
									Births Dec 1919   (>99%)
									Young	 James W	 McMorris	 Hartlepool	 
									Births Mar 1921   (>99%)
									Young	 David W	 McMorris	 Hartlepool	*
									Births Dec 1922   (>99%)
									Young	 Sarah E	 McMorris	 Hartlepool	*
									Births Jun 1925   (>99%)
									Young	 Kathleen	 McMorris	 Hartlepool	
									Births Mar 1928   (>99%)
									Young	 Christopher McMorris	 Hartlepool
									Births Dec 1929   (>99%)
									Young	 Patricia	 McMorris	 Hartlepool	* redacted?
									Births Jun 1932   (>99%)
									Young	 Peter	 McMorris	 Hartlepool	
									Births Sep 1935   (>99%)
									YOUNG	 Mary	 McMorris	 Hartlepool