Hi Caroline!
Here is some info I found in the church records on Genline. I found both their birth records in the Karlskrona Amiralitetsförsamlingen records.
Charlotta Wilhelmina was born on May 30 1818, Födde, 1813-1832, Karlskrona Amiralitetsförsamlingen, page 254. Her parents were Peter Pettersson born 1787 and Rebecca Bohman born 1794. The family can be found at VII, HFL 1811-1819, Karlskrona Amiralitetsförsamlingen, GID: 1760.315.86000, household #61.
Magnus Fredrik (Svensson) Flisberg was born April 30, 1815 in Karlskrona Amiralitetsförsamlingen. Födde, 1813-1831, GID: 1760.203.91400, page 103. His parents were Constapel Sven Flisberg, born 1771 and Anna Lovisa Petersdotter born Jan 22, 1777 in Karlskrona Amiralitetsförsamlingen. I found the family in the HFLs for 1811-1819 in Karlskrona Amiralitetsförsamlingen, page 53, GID: 1760.313.76500, HFL 1820-1825 in Karlskrona Amiralitetsförsamlingen, 14th quarter H#59, GID: 1760.5.24700, page 262, HFL 1825-1831 in Karlskrona Amiralitetsförsamlingen, 18th quarter #95+96, GID: 1760.8.71200, page 272.
Hope this info helps!
Have a nice day!
Don