HENDERSON siblings in 1891 census?

[Jang]

Can anyone find three HENDERSON siblings in the 1891 census?

According to the school records of Dudhope School they were:

Mary Henderson born 31 July 1886
Jane Henderson born 12 July 1888
Robert Henderson no birth date

all with father David Henderson, address 54 Polepark Road Rosebank.

I've searched on Ancestry without success.

Many thanks
Jan

[normamac]

Address 29 Kinloch St.

Reg. Dis: St Clement
County: Angus
Civil Parish : Dundee

David Henderson age 27 Jute Mill Overseer  Born Dundee Forfarshire
Mary wife age 28 Born  Brehin Forfarshire
Mary Ann age 6
Mary age 4
Jane Ann age 2
Robert age 7 months

All the family born Dundee Forfarshire.

[Jang]

Many thanks, Normamac, I couldn't see it for looking!