'It might be helpful to know more about other siblings in each generation.'
I visited LMA last week and found a few possible siblings. Unfortunately I didn't have enough time to check all possible dates so I have filled in a few gaps from others I found on IGI. I made the mistake of looking for Daniel's marriage in a couple of places. The entry for Daniel's birth is listed on IGI as COURCHER but I thought that I looke more like COURCHEE in the register. These are possible siblings.
Eliza COURCHEE b.24 Jun 1819; chr.19 Jul 1819 St Leonards, Shoreditch (IGI)
Elizabeth Caroline COUCHA b.23 Feb 1821; chr.27 Mar 1821 St Leonards, Shoreditch (abode
Hare St: father's ocupation=weaver)
Daniel COURCHEE b.22 Nov 1822; chr.9 Mar 1823 St Leonards, Shoreditch (abode Holywell Lane: father's occupation=weaver) ('Courcher' in IGI)
Edward COURCHEE b.1 Feb 1827; chr.7 Apr 1828 St Leonards, Shoreditch (IGI)
all born to parents John and Ann COURCHEE/COUCHA, probably Ann
CHANT married 13 Jul 1818 st
Dunstan,
Stepney.
I separated them from the John and Ann
CUSHWAY because they had at least 2 children born within a month of each other and christened at St Leonards so I reckoned that the vicar knew the difference between the families. I've not got a marriage for this pair though. Their children are
John
CUSHWAY b.11 Aug 1817; chr.1 Sep 1817 St Leonards, Shoreditch (abode
Georges Square: father's occupation=weaver)
*James
CUSHWAY b.26 Jul 1819; chr.16 Aug 1819 St Leonards, Shoreditch
*Mary Ann
CUSHWAY b.13 Dec 1822; chr.30 May 1825 St Leonards, Shoreditch
John
CUSHWAY b.6 May 1825; chr.30 May 1825 St Leonards, Shoreditch
Joseph
CUSHWAY b.7 Apr 1834; chr.5 May 1834 St Leonards, Shoreditch
All these births intermingle with those of William COURCHA and
Harriet (
SIMS) and the spellings vary for them in the same way as the first set, I think according to the vicar/curate who took the sevice, although I stopped recording this, i.e. COURCHEE/COUCHA/COURCHA.
I also have a probable birth, siblings and parents for John (Daniel's father(?))
Michael COURCHER married Elizabeth
MASON 18 Sep 1775 St Leonards, Shoreditch
Their children were (all from IGI)
Sarah Ann COURCHEE b.14 May 1779; chr.13 June 1779 St Leonards, Shoreditch
John COURSHA b.7 Nov 1784; chr.29 Nov 1784 St Leonards, Shoreditch
James COURSHEE b.30 Jun 1787; chr.22 Jul 1787 St Leonards, Shoreditch
Sarah COURSHEE b.8 Aug 1792; chr.2 Sep 1792 St Leonards, Shoreditch
The only other possible reference to a Michael COURCHER (and variants) I have found in any searches is
Michel COURCHE b.5 Jun 1752; chr.28 June 1752
La Patente French
Huguenot, Spitalfields to Jean COURCHE and Marianne
AUDRY.
Possibly Anne COURCHE b.1 May 1754; chr.19 May 1754
La Patente French
Huguenot, Spitalfields to Jean COURCHE and Marie Ann GAUDRI is his sister.